Repairing the composite metal layer of bearing bush of large rotating equipment by online repair welding is a least costly repair method. However, the welding can only be carried out in horizontal position because of the heavy bearing, the difficulty of adjusting the bearing Angle, the low melting point of composite metal and the easy flow of liquid. These difficulties limit the implementation of online repair work and form the difficult problem of repairing bearing bush defects. For repair welding only horizontal position welding, as well as the bearing rotation fixed is difficult,the professional equipment for adjusting the bearing bush welding and repair posture has been innovated, and the tools for reducing the adverse factors of the formation of wear-resistant alloy liquid welds have been developed. For poor fusion of dissimilar metal welding between bearing base metal and wear-resistant layer alloy, using the shallow penetration, easy operating method of fusion. This series of improvement measures can effectively overcome the difficulties through practice, so that online comprehensive high quality and efficient welding repair damaged wear-resistant alloy layer work can be implemented smoothly.